Made from extra-hard 7075 aluminum, this stripped A3-type upper receiver is designed to accept all mil-spec receiver components. Features M4-type feed ramps to aid in reliable feeding and a Picatinny rail with T-marks stamped into the slots for precise positioning of an optic. Military-grade, hard-anodized finish is coated with Black Teflon for natural lubricity and scuff resistance. Includes provisions for forward assist and ejection port cover; assist and cover available separately. Mfg: J P Enterprises SPECS: 7075 T6 aluminum, hard-anodized, matte black with Black Teflon finish. .250″ (6.3mm) diameter takedown/pivot pin holes.